Lock nut



FIG. 1 is a perspective view of a lock nut showing my new design;

FIG. 2 is a reduced front view thereof;

FIG. 3 is a reduced rear view thereof;

FIG. 4 is a reduced left view thereof;

FIG. 5 is a reduced right view thereof;

FIG. 6 is a reduced top view thereof; and,

FIG. 7 is a reduced bottom view thereof. 

The ornamental design for a lock nut, as shown. 